As I saw mentioned earlier, this is not for everyone.  The journey to get to Alvord was long.  We traveled Hwy 20 from Bend to Burns, 205 to Fields, Fields-Denio Rd to Alvord.  It was a long, very remote drive.  The road from Fields is gravel, so be aware.  Alvord is right off the playa.  You do get an access code with your stay to be able to drive out there.  We were warned to stay away if it rains.  It turns to mud quickly and you will get stuck.  The hotspring is pumped direct from the source.  It's murky, unfiltered, unregulated bliss.  There are two pools, so you have to get cozy with all the other soakers.  The wind was cold and fierce when we stayed.  I thought the trailer was going to tip over during the night.  We met a many nice people and had fun conversations.  Expensive for what it is, but certainly a memorable experience.